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<p>This work proposes the PLA/CF-PLA laminate composite to overcome the brittle fracture of short carbon fiber-reinforced PLA. The mode-I and mode-II fracture toughness of the PLA/CF-PLA laminate composite was investigated using an FDM-printed single-edge notch bend (SENB) and compared with neat PLA and CF-PLA samples. The effect of infill patterns without void space (linear pattern) and with void space (honeycomb pattern) was also analyzed based on fracture behavior. PLA/CF-PLA laminate showed higher mode-I fracture toughness. The CF-PLA showed higher mode-II fracture toughness, 3.5 % higher than the PLA/CF-PLA laminate. The linear pattern showed better fracture toughness than the honeycomb pattern, irrespective of material. The CF-PLA samples showed a brittle fracture compared to PLA due to poor wetting of fibers to the PLA matrix. The PLA/CF-PLA laminate showed fracture toughness similar to that of neat PLA and eliminated the undesirable brittle failure of CF-PLA without compromising the fracture load. The crack propagation path was visually inspected, and the fractured surface was analyzed using scanning electron microscopy. This study provides a new pathway for printing structural components based on short-fiber reinforced polymer composites for various engineering applications.</p>

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Mode-I and mode-II fracture toughness investigation on FDM-printed PLA/CF-PLA laminate composite

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Prachi Singhal,
  • Parul Katiyar,
  • Udhayaraman Ramachandran,
  • Saritha Davuluri,
  • Renganthan Sujithra

摘要

This work proposes the PLA/CF-PLA laminate composite to overcome the brittle fracture of short carbon fiber-reinforced PLA. The mode-I and mode-II fracture toughness of the PLA/CF-PLA laminate composite was investigated using an FDM-printed single-edge notch bend (SENB) and compared with neat PLA and CF-PLA samples. The effect of infill patterns without void space (linear pattern) and with void space (honeycomb pattern) was also analyzed based on fracture behavior. PLA/CF-PLA laminate showed higher mode-I fracture toughness. The CF-PLA showed higher mode-II fracture toughness, 3.5 % higher than the PLA/CF-PLA laminate. The linear pattern showed better fracture toughness than the honeycomb pattern, irrespective of material. The CF-PLA samples showed a brittle fracture compared to PLA due to poor wetting of fibers to the PLA matrix. The PLA/CF-PLA laminate showed fracture toughness similar to that of neat PLA and eliminated the undesirable brittle failure of CF-PLA without compromising the fracture load. The crack propagation path was visually inspected, and the fractured surface was analyzed using scanning electron microscopy. This study provides a new pathway for printing structural components based on short-fiber reinforced polymer composites for various engineering applications.